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Resources for the Repair and Maintenance of your GMC S15

GMC S15 Models:

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GMC S15 Problems

Engine -- Verified

An oil leak may develop from the distributor o-ring seal requiring replacement of the seal.

Engine -- Verified

Timing gears may wear causing a mild to severe knocking noise from the front of the engine. Replacement of the timing gears is necessary.

Exhaust & Emissions -- Verified

The oxygen sensor can fail causing Check Engine Light illumination and the engine to run rich (burn more fuel than normal).

Engine -- Verified

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The spark plug wire rubber boots may get soaked with oil, causing a misfire or rough idle.

Engine -- Verified

This engine may leak oil from the valve cover gasket.

GMC S15 Questions and Answers

Visitor, 1990 GMC S15, 2.5L 4 Cylinder, Mineral, VA

I have a 1988 GMC S15 in my shop and it will flood without cranking, only goes 30 mph, fouls spark plugs, and its hard to start hot or cold. We put brand new distributor caps, spark plugs, wires, r...

Visitor, 1990 GMC S15, Beulaville, NC

how do I change rearend oil

joehart, 1990 GMC S15, 2.8L V6, Boise, ID

I have a 1984 GMC S15 HIGHSIERRA 4x4 with extended cab. The Hydrolic clutch pedal has no freeplay and I am concerned about wearing out the clutch plate. Is there a way to adjust clutch pedal to all...

Visitor, 1990 GMC S15, 2.5L 4 Cylinder, Columbia, TN

no code, want run ,starts and dies

ejwilley, 1990 GMC S15, Randle, WA

How do I change heater core ?

GMC S15 Model Years
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